Again i apoligise if this is here already, i havent seen it if it is. With the sudden rise of ppl making "twink" characters u may have noticed that on LFG there is a lot of lowbies WTB boosts through instances such as DM, WC and SFK.
Simple idea here, just invite one of these lowbies, get their cash for the boost (if they question why u want it b4 the instance just say u dont trust them:P they could log off) and then either DC or /ignore the player. Most low lvls advertising for boosts in this manner will have a high lvl main, so u may not want to do this with ur main depending on if u have a high lvl alt or not (I do this on my 60 warrior that i rarely play, to save the rep of my priest who i raid with^^).
Chances are u will get flamed by them from their main, in whch case u /ignore again, and if u worry about the rep of ur alt (not being able to sell boosts again), it usually blows over by the next day. People have short memorys, and many ppl making twinks are desperate to get pvping (i know i was) so they will take the risk :P